1.
Mrs. Louise Holland Roberson
2.
3.
Notes and Queries - volume 4, 2nd Series - Page 9
Slotow Africana Collection (1810-1975) (MSS Acc 76)
Tagebuch des Missionars Albert Nachtigal: Band 2: Teil 2: 1881 - 1893 ; Diary of the Missionary Albert Nachtigal: volume 2: part 2: 1881 - 1893